Examine source code of Hide LinkedIn News

{
  "manifest_version": 2,
  "name": "Hide LinkedIn News",
  "version": "1.0",
  "description": "Hide that annoying LinkedIn News feed",
  "icons": {
    "48": "icons/no_linkedin_news_48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.linkedin.com/*"
      ],
      "js": [
        "hide_linkedin_news.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b30b895e-750a-4e60-abd7-a3d7b6faa4e4}"
    }
  }
}